Although there is no universally recognized citation style for veterinar medicine, the more commonly used ones are:
AMA Manual of Style online. Published by the American Medical Association. Available online through the University Library.
Citing Medicine; the NLM Style Guide for Authors, Editors, and Publishers. 2nd ed. Published by US National Library of Medicine, National Institutes of Health. Freely available online.
Journal of the American Veterinary Medicine Association. (see page 8, References). Freely available online.
Citation style guides for other disciplines are available on the Library's Citation Styles Guide.